Provided are a preparing method of a superelastomer, a superelastomer prepared using the same, and a molded article containing the superelastomer, and the superelastomer can be used as a biomaterial replacing soft tissues due to excellent strain at break and elastic recovery.

This invention relates to novel preformed stabilizers in which a portion of the polymer control agent is recovered and comprises from 10 to 1500 ppm of an inhibitor. This invention also relates to a process for preparing these preformed stabilizers, and to polymer polyols comprising these novel preformed stabilizers macromers and to a process for preparing polymer polyols comprising these novel preformed stabilizers. The present invention also relates to polyurethane foams comprising these polymer polyols, and to processes for preparing these polyurethane foams.

Disclosed are a multifunctional cement hydration heat control material and a manufacturing method therefor. The cement hydration heat control material in is a comb polymer having three side chain structures, the three side chain structures are respectively a carboxyl group, a sugar alcohol group, and a polyether structure, and the main chain of the polymer is a carbon chain structure formed by free-radical polymerization of a double bond in a double bond compound monomer. The multifunctional cement hydration heat control material can achieve integration of cement hydration heat control performance, water reduction performance, and shrinkage reduction performance in a same molecule, can achieve control focusing on a performance by means of structural adjustment, does not need multi-component compounding during use, and is more convenient. The control material is non-toxic and water-soluble, can be made to have an appropriate concentration, and is convenient to use.

The present invention relates to a curable composition for an optical material, containing (A) 100 parts by mass of a radical polymerizable monomer, (B) 0.1 to 5 parts by mass of an ultraviolet absorber composed of a benzotriazole compound having a specific structure, which has a maximum absorption wavelength of 360 nm or more and less than 380 nm and an absolute value of the difference in solubility parameter (SP value) from the radical polymerizable monomer (A) of 5.5 (cal/cm.sup.3).sup.1/2 or less, (C) 1 to 5 parts by mass of an ultraviolet absorber which is at least one selected from a benzotriazole compound, a benzophenone compound and a triazine compound and has a maximum absorption wavelength of less than 360 nm, and (D) 0.05 to 0.5 parts by mass of a radical polymerization initiator. According to the present invention, it is possible to provide a curable composition for an optical material which has an ability to cut ultraviolet rays and blue light and can be suitably used as a coating material having good storage stability and weather resistance.

A polymer having a dispersing function, a preparation method therefor and use thereof as a cement dispersant are provided. The polymer has a structural unit (a), a structural unit (b) and a structural unit (c). The structural unit (a) is provided by an unsaturated polyether, the structural unit (b) is provided by an unsaturated acid and/or a salt thereof and/or an anhydride thereof, and the structural unit (c) is provided by a silane and/or siloxane having a polymerizable group and no less than five carbon atoms. The molar ratio of the structural unit (a), the structural unit (b) and the structural unit (c) is 1:(1-20):(0.01-0.5); and the polymer has a weight average molecular weight of 20,000-90,000 g/mol.

A method of making a collection of polymer particles comprising (A) performing free radical polymerization (A) on an emulsion (E1) that comprises a collection of droplets dispersed in an aqueous medium, wherein the droplets comprise (i) one or more Si-containing monomers; (ii) one or more monovinyl acrylic monomers; and (iii) one or more graftlinkers that have no silicon atoms; to form a dispersion (D1) of core polymer particles in the aqueous medium; (B) in the presence of the dispersion (D1) of core polymer particles, performing aqueous emulsion polymerization (B) on one or more acrylic monomers.

According to the present invention, an ultraviolet curable silicone composition for stereolithography, which contains

(A) an organopolysiloxane that has two groups represented by formula (1)

##STR00001##

(wherein each R.sup.1 independently represents a monovalent hydrocarbon group having 1-20 carbon atoms; R.sup.2 represents an oxygen atom or the like; R.sup.3 represents an acryloyloxyalkyl group or the like; p represents a number satisfying 0≤p≤10; and a represents a number satisfying 1≤a≤3) in each molecule,
(B) an organopolysiloxane resin that is composed of (a) a unit represented by formula (2)

##STR00002##

(wherein R.sup.1-R.sup.3, a and p are as defined above), (b) an R.sup.4.sub.3SiO.sub.1/2 unit (wherein each R.sup.4 independently represents a monovalent hydrocarbon group having 1-10 carbon atoms) and (c) an SiO.sub.4/2 unit, and wherein the molar ratio of the total of the unit (a) and the unit (b) to the unit (c) is within the range of 0.6-1.2:1 and
(C) a photopolymerization initiator has a viscosity that is applicable to a stereolithography system such as lifting system and forms a cured product which has excellent physical properties of rubber.

Vulcanizates with desirable properties can be obtained from compounds incorporating polymers that include hydroxyl group-containing aryl functionalities. The functionalities can be incorporated by using any or all of appropriate initiators, monomers and optional terminating compounds. Such polymers exhibit excellent interactivity with both conventional and non-conventional fillers.

Vulcanizates with desirable properties can be obtained from compounds incorporating polymers that include hydroxyl group-containing aryl functionalities. The functionalities can be incorporated by using any or all of appropriate initiators, monomers and optional terminating compounds. Such polymers exhibit excellent interactivity with both conventional and non-conventional fillers.

Provided are a curable resin mixture and a curable resin composition which contain a polyalkenylphenol resin and an aromatic polymaleimide compound having high crystallinity and a high melting point, and which exhibit excellent fluidity and reactivity. Also provided is a method for producing a curable resin mixture that contains: (A) a polyalkenylphenol resin which contains a polyalkenylphenol compound having at least 2 phenol skeletons in the molecule, a prescribed 2-alkenyl group being bonded to some or all of aromatic rings that form the phenol skeletons in the molecule; and (B) an aromatic polymaleimide compound. The method comprises: heating the aromatic polymaleimide compound (B) to the melting point or above and thereby melting the compound; and mixing the molten aromatic polymaleimide compound (B) and the polyalkenylphenol resin (A) within a temperature range at which the aromatic polymaleimide compound (B) does not recrystallize.